Solar panel



FIG. 1 is a top plan view of a solar panel according to a first embodiment of our design;

FIG. 2 is a top plan view of a solar panel according to a second embodiment of our design;

FIG. 3 is a top plan view of a solar panel according to a third embodiment of our design; and,

FIG. 4 is a top plan view of a solar panel according to a fourth embodiment of our design. 

CLAIM The ornamental design for a solar panel, as shown and described. 